1.1 JM-IV model machine for testing abrasion resistance

1.2 Dust collector

1.3 Sandpaper (180#)

1.4 Adhesive tape with two adhesive sides

2. SAMPLING

2.1 1 sample per lot

2.2 Length: （110±2） mm

2.3 Width: （110±2） mm

3.TESTING PROCEDURE

3.1 We keep the sample for 7 days within a 21-25 ℃ temperature range and a 45-55 % relative humidity rage.

3.2 We keep the sandpaper dry. We stick the sandpaper on the wheels making sure there is no gap or overlap in the joint.

3.3 We install two wheels on the machine and adjust the cycle meter to 0. We clamp the samples and lay the wheels on the samples. We then switch on the dust collector and the machine. Every 500 cycles, we replace the sandpaper.

3.4 We note the number of cycles when the Initial Point (IP) of abrasion is reached.

3.5 We then continue with the cycles.

3.6 When the Final Point (FP) of abrasion is reached, we note again the number of cycles.



4.ASSESSING TEST RESULTS

P = (IP+FP)/ 2
P: Abrasion resistance (r)

We add IP and FP and divide by two. This gives us the average abrasion resistance in number of cycles, or P.

If P ≥ 6,000 cycles, the product has a minimum AC3-31 abrasion resistance.
If P ≥ 9,000 cycles, the product has a minimum AC4-32 abrasion resistance.

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